I've never done any processing on my audio, and have an instructor review score over 4.5 from hundreds of thousands of happy students. Perhaps it isn't really necessary. I used a Blue Yeti for years, and lately have been using a Shure SM7B. If you just want to boost bass and treble, you could run an XLR mic into a mixer that has EQ knobs. That way the "processing" would be done before your audio is even captured. I use a Mackie ProFX8 mixer which can do this, but I still leave the EQ flat. Nobody's ever complained about the audio quality. You can also influence the sound of your mic just by varying your distance to it. If you want a warmer sound, just get closer to the mic. It may be that you simply have higher standards than your students do, or have different expectations for what "good" audio sounds like.
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